Sigma has confirmed that there is an incompatibility issue between its HSM equipped lenses and the new Nikon D200. Specifically the HSM lenses do not operate when the 'AF-ON' button is pressed on the rear of the camera. This does not affect auto-focus carried out using the shutter release button (half-press). Sigma has stated that this is due to a firmware bug in the lens itself and will soon be introducing a free of charge firmware update for affected lenses.
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Sigma has confirmed that there is an incompatibility issue between its HSM equipped lenses and the new Nikon D200. Specifically the HSM lenses do not operate when the 'AF-ON' button is pressed on the rear of the camera. This does not affect auto-focus carried out using the shutter release button (half-press). Sigma has stated that this is due to a firmware bug in the lens itself and will soon be introducing a free of charge firmware update for affected lenses. 